PDA

View Full Version : ISP OF ST95160


adam28
11th July, 2009, 12:52 PM
Hi guys

Im trying to read a ST95160 in a ECU in circuit with a chip clip.
Im getting FF FF FF on every line. someone said to me that i need to cut a trace to stop the the circuit powering up so then i can read the eeprom. I have not been doing this for very long.So not sure what he means. If anyone could explain in real simple terms i would be very greatful. Or is there another way other than Desoldering.
When i bought the clip i thought all i had to do was connect clip to eeprom on pcb and then to my programmer. and then it would read. Not that easy!:hmmmm2:
On the 95160 chip im trying to read it does not have a dot on it to tell you what is the number 1 Pin.

Any help much appreciated.:beer:

Regards

Adam
boorawchick
11th July, 2009, 01:07 PM
What is the problem with desoldering? There are a lot of aspects concerned in circuit programming so if you have no problems to get to the chip the best way is to desolder it, imho. If the chip has no dot - it has "saw off" side.
adam28
11th July, 2009, 01:11 PM
No prob with desoldering, just want to learn how to do in circuit.
Thanks for your reply
adam28
11th July, 2009, 01:16 PM
Sorry for my inexperience, but what is saw off side?
boorawchick
11th July, 2009, 01:17 PM
Before making any experiments with in-circuit, read out the dump, if you hasn't done it... Try to lower reading voltage on your programmer.
boorawchick
11th July, 2009, 01:21 PM
Sorry for my inexperience, but what is saw off side?
I don't know how to say it in English... If you look on chip from the side
/____| ( / - is "saw off" side :) )
adam28
11th July, 2009, 01:24 PM
My programmer uses power from usb so pretty low voltage with no success.
boorawchick
11th July, 2009, 01:32 PM
My programmer uses power from usb so pretty low voltage with no success.
no,no,no in you programmer settings you should be able to lower the voltage 5.0 volts is default, try 3.0-3.3 volts first.
PremierD
11th July, 2009, 01:43 PM
My programmer uses power from usb so pretty low voltage with no success.

The 95160 is an spi eepom .. you should remove and read out of circuit ..to be safe..all you need to do is have a bad contact while reading and your all ffffffffed..it is much safer to remove... but not like your clarion radio..:hmmmm2:

P.S. the saw edge is to let you know wher pin 1 is...
With the Saw (champered edge) to wards you pin 1 is far left...
adam28
11th July, 2009, 02:49 PM
Thanks for all your help guys. I desoldered in the end and job done, but i still want to get to grips with all this ISP.
Im abit of a nightmare once i get started on something i cant stop!:musicus:

Regards
boorawchick
11th July, 2009, 03:47 PM
Only one thing, as I've already said - it may be very expensive to start experiments with isp without original dump been read.